This is particularly true if the guy has a beer bottle sized penis. To make absolutely sure you don’t scrape your teeth on him, open your mouth wide. One of the biggest turnoffs is to hear someone gag while he’s blowing you. Some people may not agree with this but think about it. Do you want to hear someone sound like they are about to throw up when they’re sucking on you? To avoid this from happening, take him one inch at a time. The way you breath is important when sucking dick.
If you do it right, you’ll be able to drain him for long periods of time. Slowly take in air through your nostrils and exhale the same way. Once you’ve got a good bob going, you’ll want to coordinate your mouth and hand to work in tandem. Before you can do that, you’ve got to establish hand contact. Just cup your hand around it while you are sucking. You may need to practice on a toy to get this part right.